Eugene d



E. D. EBY

April 15 I924.

BUSHING Filed May 5,

u m g i a n z e 5 Wm fl" a u E Patented Apr. 15, 1924.

UNITED STATES PATENT OFFICE.

EUGENE D. EBY, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOB. T0 GENERALELECTRIC COMPANY, A CORPORATION OF NEW YORK.

Application filed May 5, 1919.

To all whom it may concern:

Be it known that I, EUGENE D. EBY, a citizen of the United States,residin at Pittsfield, in the county of Berkshire. tate ofMassachusetts, have invented certain new and useful Improvements inBushings, of which the following is a specification.

My invention relates to bushings ada ted to house the leading-inconnections or encased electrical apparatus, and has for an object animproved construction which is durable, weather roof, and economical.

More specific-a1 ymy invention relates to bushings forcurrenttransformers and current metering devices which have theirwindings arran ed in a plurality of sections; and is designe to'providenot'only a safe insu lating structure but to provide'convenient meansfor changingthe connections to the winding sections in a safe andeconomical manner. 4

In bushings for use on current transformers in service with hi hpotential conductors, it is necessary to insu ate the incoming leadsfrom the line from and, although little insulation is require betweenleads themselves in the-bushing, since their relative'differencefofpotential is small." Also where the current transformer isfof standardconstruction it' is necessary "generally to provide suitable means forchanging theratio of transformation Thischan'ge in the ratio oftransformationfis conveniently eil'ec ted by changing the connections tothe primary u which is usually made in two or more sections such changein connections generally comprises a change from series tomultipleconnection or vice versa. 1 v

Heretofore it has been customary to bring a plurality of leads out fromthe windings to the exterior of the bushing where the desiredconnections were made.

This ractice however is accompanied by the to lem of making the joint inthe connections proof against the weather and also proof electricallyagainst grounds, etc. and when once made is often changed only withdifiiculty.

In the practice of my invention, such changes may be readily efi'ectedand the connections are always protected when in service in a safe andweather-proof manner because I provide the bushing structure with ahousingfor the lead terminals, which is an integral part of the bushing.This hous- BUSHING.

Serial No. 294,831.

all the parts.

For a more complete understanding of the nature and objects ofinvention, reference should be had to the following detailed descriptionof my invention as applied to the construction of bushings when taken inconnection with the accompanying drawing in which:

Fig; I shows a bushing partly in elevation and partly insection'constructed' to embody 'my invention. Figs. 2 and 3 show planviews of the various. electrical connections afiordedby the use of myinvention, 4 is a fragmentary sectional view showing certaindetails ofmy invention, and Fig. .5 showsindiagrammatic fashion the general schemeof connections for sections of a primary winding served by my improvedbush ng.

{material The pendent member is supported from the top of the bushingstructure through the tube whichengages with an interior portion ofthecap 13.

Instead of directly fasteningthe ring 12 to the tank'of the currenttransformer or other apparatus served by the bushing, an auxiliary ringor collar 14 is preferably employed. since a wider range of adaptabilityis thus procured, to which collar the ring 12 is bolted or otherwisesecured, the collar 14 in turn being secured to the apparatus casing(not shown).

To avoid, and hence to protect against, a difference of potential acrossvarious points on the interior of the casing in the space above thesurface of the liquid cooling and insulating medium,- shown at s, Iprovide a conducting shield 17, supported on the surface of the pendentmember, the shield being constructed with rolled ends and provided withthe conducting spinning 18 which has a ground connection shown at 18'(see Fig. 4) made substantially as explained in U. S. Letters Patent No.1,304,283 issued in my name May 20, 1919. The spinning 18 thus providesa convenient closure for the lower end of member 11 and will also serveas a support for any insulating filling which it may be desired to placetherein. To insure a weather tight joint between the ring 12 and collar14, one or more gaskets, such as shown at g and g are inserted. Wherethe spinning 18 has a special grounding connection, as shown at 18, thegaskets will with advantage be made to embrace the projecting rim orcollar portion of the spinning, one on each side as shown in Fig. 4.

Four leads 20 are brou ht out from the sections of primary winding,-here shown as two in number and denoted w and 'w in Fig. 5, for the aparatus'served and are brought up throng the tube 15 into the cap 13 andare there secured to suitable terminals (2, b, a and d mounted on aterminal board 21. The leads 22 to the aerial connections pass outthrough suitable outlets or pockets 23 formed in the cap 13. A separatepocket for each lead 22 is here shown, though obviously a single pocketwould do.

To support the terminal board in place and also to impose a definitepotential upon a stop 26 is provided in the upper end of the tube 15.This stop consists of one or more discs of insulating-materialperforated to accommodate the four leads 20.- To fix this stop 26 in adefinite posi- 'tion with respect to the leads 20, a wrapping of cord 27or other insulating material 1886- cu'red on the leads 20 which wrappingprevents thestop 26 from-passing lower on the leads. The ends of theleads 20 which en- 'ter the cap 13 may be reinforced by a furtherwrapping of insulatin material as shown at 28 and heldis the desiredspaced relation by an insulating plug 29.

The cap 13 which thus houses the terminal board 21, is closed by asuitable cover 30 secured thereto in a weather tight manner by means ofbolts 31. The cover 30 is also shown as having a threaded recess 32,engaged by astud 33.

bars, shown at 40 and 41 in Fig. 2, are connectcd respectively acrossterminals a, b, and 0, 1. The current then coming in on a lead 22 to theterminal a, while traversing the winding w in flowing to terminal a,thence to d and to the other lead 22. will branch from terminal a toterminal I; and traverse winding w in parallel with winding w comingdirectly to the other lead 22 by way of terminal (I.

l/Vhen again it is desired to change the ratio of transformation fromthat given by the multiple arrangement to that given by the seriesarrangement, the cover 30 having been removed, the series connection iseffected by connecting a conducting bar,

shown at 45 in Fig. 3, across the terminals 2), 0. The current thencoming in on one lead 22 to terminal a will traverse winding w flowingto terminal 0, and thence through the bar 45 to b to traverse winding in(since it is now in series with winding 40) whence it will flow to theother lead 22 by way of terminal d.

Having now described what isat preseat the best means known to me forcarrylog out my invention, I would have it un' derstood that such meansare merel illustrative and that I do not mean to be l i thereby to theexact details shown nor in the choice of recognized equivalents exceptas defined in my claims hereunto appended;

mited hat I claim as new and desire to secure a by Letters Patent of theUnited States,

tion with an upper hollow insulatin member, of a hollow cap secured tosai mem her and comprising a base portion with side outlets and aremovable cover, a tubular member within said insulating member anddepending from said cap, a terminal board mounted within said cap, and aplurality of leads extending through said tubular member from saidterminal board.

2. In a bushing structure, the combination with an insulating member, ofa-pendent tubular member 'projecting from the lower end of the firstsaid member, a main fastening ring secured to said lower end, anauxiliary ring securedto said main fastening ring, a conducting memberon the projecting portion of said tubular member provided with a collarprojecting between said rings, and means for makings: weather ti ht sealbetween said rings and said co lar.

3. In a bushin structure the combination with an ins ating member, of apendent tubular member projecting from the lower end of the first saidmember, a main fastening ring secured to said lower end, an auxiliaryring secured to said main fastening ring, a conducting sleeve on theprojecting portion of said tubular member, a conducting spinning securedto said sleeve and having a rim projecting between said rings, means formaking a weather ti ht seal between said rings and said rim, an a groundconnection between said spinning 16 and said auxiliary ring.

4. A bushing structure comprising up?! and lower insulating members, amain astening ring on said upper member, an auxiliary ring secured tosaid main ring, and a conducting member overlyin a portion of thesurface of said lower insu ating member havi a collar projecting betweensaid rings, an d weather tight acking means between said collar and saidrings.

In witness whereof, I have hereunto set my hand this 2nd da of Ma 1919.

i JUGE E D. EBY.

